Because you probably don't want to look like the kids at Bonnaroo, a few lessons you can take from the best acts at this summer's music festivalsBy Aaron Krach

Julian Casablancas (The Strokes)

Julian Casablancas (The Strokes)

His look: With a grown-out shag, the lead singer of The Strokes looks like he's gone back in time these days. What used to be messed-up-just-so is now longer and almost all the same length. He stopped layering it and has just had the bottom cut. Short bangs keep him from looking like a total hippie, and break up that large forehead, which is good. Because he's cut his hair at shoulder-length, he still looks like he's (vaguely) in control.

Get the look: Let it grow. If you have a thick head of hair, God bless, because otherwise your style will just look limp. Keep some bangs and muss it up with a grooming cream for added body.

Kid Cudi

Kid Cudi

His look: After years of super-short buzz cuts, Cudi is letting it out. With the added thickness, his barber can carve the sharp lines around his face with the edge of the clippers. It's a good look: clean, frames his face.

Get the look: Lose the scruffy few-days-beard if you've got a lid like Cudi's. It's confusing and forms too sharp a contrast from the clean line across the Kid's forehead.